this might have been a typo and i can build a kernel with DRMDEBUG now (failed in radeon_benchmark.c).
-f -- i got real close to seeing elvis but my shovel broke.
Index: drmP.h =================================================================== RCS file: /cvs/src/sys/dev/pci/drm/drmP.h,v retrieving revision 1.195 diff -u -p -r1.195 drmP.h --- drmP.h 18 Apr 2015 14:47:34 -0000 1.195 +++ drmP.h 30 May 2015 17:36:29 -0000 @@ -188,7 +188,7 @@ drm_can_sleep(void) curproc->p_pid, __func__ , ## arg) -#ifdef DRM_DEBUG +#ifdef DRMDEBUG #define DRM_INFO(fmt, arg...) printf("drm: " fmt, ## arg) #else #define DRM_INFO(fmt, arg...) do { } while(/* CONSTCOND */ 0)